ecological statistics

  1. A

    How to do Redundancy Analysis (RDA) in SPSS?

    I am using stats to assess data collected for my dissertation - looking at invertebrate families and how their community composition is affected by habitat. I've been advised to carry out a constrained ordination or RDA, with the taxa as response variables and habitats as explanatory...
  2. J

    what stats to use?

    Dear All, As I am not experienced in stats I would like to ask for some stats suggestions for a study. study one: control impact with one impacted site and one reference site. Two species and biometrics taken. I need to see if the the impacted site increases biometrics. study two...
  3. A

    Detecting Change in not Normally Distributed Count Data

    Hello, I was wondering if anyone could shed some light on how to interrogate count data whichholds a lot of 0'sand therefore not normally distributed. I have pasted in an example of the dataset i'm using. It gives 4 species counts across 27 sites (replicates) across intermittent years...
  4. D

    Stream temperature over time: is a repeated measures ANOVA my best bet?

    I am trying to analyze temperature data across 5 sites taken over approximately 4 months and am having trouble working out the best test to use (I'm out-of-practise with stats!). The data: Five temperature data loggers were set out along a river. Three were spaced along tributary A, one...
  5. trinker

    Ecologists & Sociologist views wanted: Species found together

    I am curious about some ecological statistics/scores. I believe that across times species of animals may migrate to different locations. This movement is likely due to resources (or in the human population interests as well). I posit that we can measure the migration (amount of...
  6. S

    Ecological Data advice on which test

    I have done an experiment and am in dire need of some advice on statistical methods that I should use to answer the questions I seek. The experiment involved growing one species on a glass slide that had the surface area of 3800mm2, these species included 2 natives and 3 introduced species...
  7. M

    Multivariate data set of two groups: finding which variables are statistically diff.

    I have a data set consisting of two different groups (A and B) each with 5 specimens. We tested 73 different variables in each specimen and recorded the data. I am new to statistics, so I am struggling to find the best method(s) in which to analyse the data so that I can find which variable(s)...
  8. J

    Help with attribution/causality

    Hello everyone! I am new to this forum, but excited to become more involved :tup: I am currently a mathematics/statistics student and I am looking for some ideas on how to proceed with some of my summer research. I hope I posted this in the right forum, if not, sorry! I have recently...
  9. T

    How to analyze different, complex data sets?

    I'm looking for a good way to compare data sets. For 20 months, we collected larval fish using standard sampling gear (produces larval fish/cubic meter) at 31 sites along 95 km river miles. We identified, categorizes to developmental stage, and measured several hundred thousand larval fish...